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Search found 6195 matches

by ProPower engines
Thu Jul 02, 2020 4:30 pm
Forum: Engine Tech
Topic: 781 bb Chevy heads can I cut spring seat?
Replies: 10
Views: 211

Re: 781 bb Chevy heads can I cut spring seat?

Too Pro Power: Are you aware 781 head castings, depending on the year have different spring pocket depths? I would guess the OP has 1975 or newer castings. If the OP wants to post what year castings he has I will tell the OP exactly how far he can cut the intake spring seat pockets. Yes I was.That ...
by ProPower engines
Wed Jul 01, 2020 7:39 pm
Forum: Engine Tech
Topic: 781 bb Chevy heads can I cut spring seat?
Replies: 10
Views: 211

Re: 781 bb Chevy heads can I cut spring seat?

I have a set of 781 bb Chevy heads and the intake valves has a spring height of 1.750 can I cut .100-.130 off the spring seat so I can get a 1.850-1.880 spring height? I sonic check the seats and found I can go .050 deeper. I would not go any deeper then .050 then use a +.050 lock to get to 1.850"....
by ProPower engines
Mon Jun 29, 2020 7:42 pm
Forum: Engine Tech
Topic: Severe engine overheat = now overheating oil???
Replies: 18
Views: 470

Re: Severe engine overheat = now overheating oil???

Does the cam bearing have a groove on the back side of the bearing??? That and 3 feed holes so they can be clocked correctly?? Been using the Dart supplied bearings lately up here and that is how they are made. Have not tried any others so I am guessing the ford uses the same style as the GM block d...
by ProPower engines
Thu Jun 18, 2020 2:15 am
Forum: Engine Tech
Topic: The funk...
Replies: 17
Views: 816

Re: The funk...

One thing we noticed in the wrecking yard is new cars with sealed fuel systems seems to let fuel stay fresh for much longer periods of time then older vented systems We had to remove all fuel tanks before shredding anyway as a fire prevention measure but on the newer vehicles the sealed systems had ...
by ProPower engines
Thu Jun 18, 2020 1:59 am
Forum: Engine Tech
Topic: Rings for mild blown application
Replies: 7
Views: 221

Re: Rings for mild blown application

Build it and set it up as if it will run at WOT ALL THE WAY ACROSS THE LAKE AND BACK AGAIN.. wide open. Cause it will. I totally agree with F-Bird 88!. Boats are a different animal. Mark does know lots about pistons but my concern as a builder is most boaters never really get the fact that engines ...
by ProPower engines
Wed Jun 17, 2020 7:02 pm
Forum: Engine Tech
Topic: 454 BBC blocks
Replies: 11
Views: 842

Re: 454 BBC blocks

the newer block has a check valve right under the oil filter threaded insert and another check valve just to the side of it. I will not be running an oil cooler. Do these both need to be installed ? The motor had a oil cooler on it before or at least some type of oil filter extension or adapter. ED...
by ProPower engines
Wed Jun 17, 2020 6:56 pm
Forum: Engine Tech
Topic: Oil Smoke driving me crazy
Replies: 100
Views: 3439

Re: Oil Smoke driving me crazy

I would measure the stems and just use a new press in guide and fit the valves to them. Liner-ing some guides can be a PITA as the section of guide that is not encased in the head will grow and spring back smaller creating a tapered area of the exposed part. Measure and ream .0003 to .0005 undersiz...
by ProPower engines
Tue Jun 16, 2020 1:26 pm
Forum: Engine Tech
Topic: Oil Smoke driving me crazy
Replies: 100
Views: 3439

Re: Oil Smoke driving me crazy

I would measure the stems and just use a new press in guide and fit the valves to them. Liner-ing some guides can be a PITA as the section of guide that is not encased in the head will grow and spring back smaller creating a tapered area of the exposed part. Measure and ream .0003 to .0005 undersiz...
by ProPower engines
Mon Jun 15, 2020 7:26 pm
Forum: Engine Tech
Topic: Valve seat rim sitting proud in chamber - Detonation risk?
Replies: 16
Views: 658

Re: Valve seat rim sitting proud in chamber - Detonation risk?

Where would I get the seats - any idea? My machinist said he didn't think his regular source would have the size. Figure out what OD and ID you need and call Durabond. They have an excellent selection of small seats. Use the 7000 series they last longer in HP applications. SBI will have something a...
by ProPower engines
Mon Jun 15, 2020 4:53 pm
Forum: Engine Tech
Topic: Oil Smoke driving me crazy
Replies: 100
Views: 3439

Re: Oil Smoke driving me crazy

I would measure the stems and just use a new press in guide and fit the valves to them. Liner-ing some guides can be a PITA as the section of guide that is not encased in the head will grow and spring back smaller creating a tapered area of the exposed part. Measure and ream .0003 to .0005 undersiz...
by ProPower engines
Mon Jun 15, 2020 4:46 pm
Forum: Engine Tech
Topic: Torque to turn over Engine
Replies: 9
Views: 505

Re: Torque to turn over Engine

Even the narrow ring type pistons. I just went through this with a name brand piston set but the rings supplied as it turned out were too shallow in the groove. After some shim stock was used behind the top ring it closed up the gap and leakage showed 0 on the blow by meter =D> Not trying to hijack ...
by ProPower engines
Mon Jun 15, 2020 4:17 pm
Forum: Engine Tech
Topic: Torque to turn over Engine
Replies: 9
Views: 505

Re: Torque to turn over Engine

Just be sure to check the radial depth of the ring groove and compare to the top ring for back clearance. i did a 400 M a while back and found I needed to space the top ring with ring shim stock to correct the issue. Otherwise you can be in a situation where there is too much room behind the ring an...
by ProPower engines
Mon Jun 15, 2020 4:08 pm
Forum: Engine Tech
Topic: Valve seat rim sitting proud in chamber - Detonation risk?
Replies: 16
Views: 658

Re: Valve seat rim sitting proud in chamber - Detonation risk?

For the time it will take to correct the issue I would replace the seats. I have seen this before on some engines and even though it seems fine the erosion between the seat and the casting can be greater then you think. the last head I seen did drop a seat a few months later cause the customer did n...
by ProPower engines
Mon Jun 15, 2020 4:01 pm
Forum: Engine Tech
Topic: Oil Smoke driving me crazy
Replies: 100
Views: 3439

Re: Oil Smoke driving me crazy

I would measure the stems and just use a new press in guide and fit the valves to them. Liner-ing some guides can be a PITA as the section of guide that is not encased in the head will grow and spring back smaller creating a tapered area of the exposed part. Measure and ream .0003 to .0005 undersize...
by ProPower engines
Mon Jun 15, 2020 3:14 pm
Forum: Engine Tech
Topic: Valve Springs?
Replies: 20
Views: 644

Re: Valve Springs?

What length of valve are you using??
Stock length or +.100 longer?? I always go longer to avoid the issue of not enough installed height. Its easier to use a longer valve and spring combo on those heads to avoid the machining of the spring seats.